Revert addition of test_install target

Makefile

@@ -34,9 +34,9 @@ endif
 
 LAPACK_NOOPT := $(filter-out -O0 -O1 -O2 -O3 -Ofast,$(LAPACK_FFLAGS))
 
-SUBDIRS_ALL = $(SUBDIRS) test ctest utest test_install exports benchmark ../laswp ../bench cpp_thread_test
+SUBDIRS_ALL = $(SUBDIRS) test ctest utest exports benchmark ../laswp ../bench cpp_thread_test
 
-.PHONY : all libs netlib $(RELA) test ctest test_install shared install
+.PHONY : all libs netlib $(RELA) test ctest shared install
 .NOTPARALLEL : all libs $(RELA) prof lapack-test install blas-test
 
 all :: libs netlib $(RELA) tests shared
@@ -155,11 +155,6 @@ endif
 endif
 endif
 
-test_install :
-	mkdir -p install
-	PREFIX=install $(MAKE) install
-	$(MAKE) -C test_install all
-
 libs :
 ifeq ($(CORE), UNKNOWN)
 	$(error OpenBLAS: Detecting CPU failed. Please set TARGET explicitly, e.g. make TARGET=your_cpu_target. Please read README for the detail.)
@@ -404,5 +399,4 @@ endif
 	@$(MAKE) -C relapack clean
 	@rm -f *.grd Makefile.conf_last config_last.h
 	@(cd $(NETLIB_LAPACK_DIR)/TESTING && rm -f x* *.out testing_results.txt)
-	@rm -rf install
 	@echo Done.